CN114301364A - Single-phase current phase control method - Google Patents
Single-phase current phase control method Download PDFInfo
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- CN114301364A CN114301364A CN202210071866.6A CN202210071866A CN114301364A CN 114301364 A CN114301364 A CN 114301364A CN 202210071866 A CN202210071866 A CN 202210071866A CN 114301364 A CN114301364 A CN 114301364A
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Abstract
The single-phase current phase control method comprises the steps of firstly measuring the angle of a motor rotor in real time and converting the angle into a normalized electrical angle; then, current sensors are used for acquiring current of each phase in real time, the current zero crossing point in each electrical cycle is calculated, based on the principle that the difference between the current zero crossing point and the phase of the counter electromotive force zero crossing point is minimum, the phase of the current is obtained through an interpolation method according to the current value and the phase value before and after the zero crossing point, the phase of each phase of the current is subjected to independent phase closed-loop control, and the magnetic field increasing or weakening control of the motor is realized by controlling the lagging or advancing of the phase of the current by each corresponding counter electromotive force, namely by controlling the positive or negative of the difference between the phase of the counter electromotive force and the phase of the current. The invention has the advantages of simple structure, clear physical concept and the like, does not need to calculate coordinate transformation in real time, reduces algorithm complexity, improves the dynamic performance of system control, and in addition, only measures the current zero crossing point, improves the robustness of measurement and further improves the robustness of system control.
Description
Technical Field
The invention relates to the field of motor control, in particular to a single-phase current phase control method.
Background
In a three-phase motor driving system, in order to realize the magnetization or flux weakening control of a motor, namely, to control the direct-axis armature reaction to have the magnetization or flux weakening function, the direct-axis current and the quadrature-axis current need to be measured in real time, but the direct-axis current and the quadrature-axis current can only be obtained through CLARK conversion and PARK conversion instead of direct measurement. This conventional method has very high requirements on current detection accuracy, noise, real-time performance of coordinate conversion, and operating speed of the processor. In addition, the calculation amount of coordinate conversion is larger for a motor driving system adopting an independent H-bridge driving topological structure, especially for a multi-phase motor system, and if the coordinate conversion mode is adopted, the requirements on current detection precision, noise, real-time performance of coordinate conversion and running speed of a processor are higher.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art, provides a single-phase current phase control method, has simple structure, clear physical concept and high operation speed, and is particularly suitable for a modular multiphase motor drive control system.
The technical scheme of the invention is as follows: the single-phase current phase control method is characterized in that the phase of current can be measured by measuring the current zero crossing point in each electrical cycle through a current sensor of each phase, so that the phase closed-loop control of each phase of current can be realized, the plus-flux or the minus-flux control of a motor can be realized by controlling the phase lag or the lead of each corresponding counter electromotive force of the current, namely by controlling the plus and minus of the difference between the phase of each counter electromotive force and the phase of each phase of current, and the steps are as follows:
1) measuring the angle of the motor rotor in real time, and converting the angle into a normalized electrical angle according to the number of pole pairs of the motor rotor;
2) acquiring each phase of current in real time by using a current sensor, and calculating a current zero crossing point in each electrical cycle;
3) based on the principle that the phase difference between the current zero-crossing point and the counter electromotive force zero-crossing point is minimum, and according to the recorded current values and phase values before and after the zero-crossing point, the phase of each phase of current is obtained through an interpolation method;
4) and taking the expected phase as an input quantity, making a difference with the actual phase of each phase of current, inputting the difference to a phase controller, obtaining the control voltage of each phase, then sending the control voltage to a speed controller, obtaining the rotating speed of the motor, and obtaining the expected phase of each phase of current through the motor, thereby realizing the independent closed-loop control of each phase of current.
Compared with the prior art, the invention has the advantages that:
(1) has the advantages of simple structure, clear physical concept and the like.
(2) The coordinate transformation does not need to be calculated in real time, the algorithm complexity is reduced, and the system control dynamic performance is improved.
(3) Only the zero crossing point of each phase of current needs to be measured, so that the robustness of measurement is improved, and further the robustness of system control is improved.
(4) According to the logic relation of the winding phases of all phases, the phases of other phases of currents can be deduced according to the current phase of a certain phase, so that the mutual redundancy backup function of the phase detection of all phases of currents can be realized, and the reduction of the system control performance caused by the fault of a certain current sensor is avoided.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a block diagram of the phase closed loop control of the present invention;
fig. 3 and 4 are phase diagrams of each phase winding in the magnetizing control and the demagnetizing control, respectively.
Detailed Description
The single-phase current phase control method provided by the invention is explained by using a main propulsion motor system of a distributed electric propulsion airplane, the main propulsion motor system adopts a modular structure, a driving topology adopts an independent H-bridge driving topology structure, and each phase winding of the motor is electrically and independently controlled and decoupled from other windings. In the invention, the phase of the current can be measured by measuring the current zero crossing point in each electrical cycle through the current sensor of each phase winding, so that the phase closed-loop control of each phase of the current can be realized, the magnetism increasing or weakening control of each phase winding of the motor can be realized by controlling the phase lag or the lead of the current to each corresponding back electromotive force, namely by controlling the positive and negative of the difference between each phase of the back electromotive force and each phase of the current, the electromagnetic field generated by each phase winding is subjected to magnetic circuit synthesis in an air gap, and the magnetism increasing or weakening control of the whole motor is finally realized. The single-phase current phase control method of the invention is shown in the attached figure 1, and comprises the following specific steps:
1) measuring the angle of the motor rotor in real time, and converting the angle into a normalized electrical angle according to the number of pole pairs of the motor rotor;
2) acquiring each phase of current in real time by using a current sensor, and calculating a current zero crossing point in each electrical cycle;
3) based on the principle that the phase difference between the current zero-crossing point and the counter electromotive force zero-crossing point is minimum, and according to the recorded current values and phase values before and after the zero-crossing point, the phase of each phase of current is obtained through an interpolation method;
4) the expected phase is used as an input quantity, the difference is made with the actual phase of each phase of current, the input is sent to a phase controller, the control voltage of each phase is obtained, then the control voltage is sent to a speed controller, the rotating speed of the motor is obtained, the expected phase of each phase of current is obtained through the motor, and therefore the independent closed-loop control of each phase of current is achieved, and the independent closed-loop control is shown in the attached figure 2.
After closed-loop control is performed on the phase of each phase of current, typical operating conditions of each phase of winding are represented by magnetic increasing control (the phase quantity of the magnetic increasing control is shown in the figure 3) and magnetic weakening control (the phase quantity of the magnetic weakening control is shown in the figure 4), wherein psi is the phase I of each phase of current1With each opposite electromotive force E0Is called the internal power factor angle, I1Advance E0Is positive when the current is positive; delta is the control voltage per phase Ulead per counter electromotive force E0Angle of (d), power angle, also known as torque angle;
advancing control voltage U per phase by phase current I per phase1I.e. power factor angle.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (1)
1. The single-phase current phase control method is characterized in that the phase of current can be measured by measuring the current zero crossing point in each electrical cycle through a current sensor of each phase, so that the phase closed-loop control of each phase of current can be realized, the plus-flux or the minus-flux control of a motor can be realized by controlling the phase lag or the lead of each corresponding counter electromotive force of the current, namely by controlling the plus and minus of the difference between the phase of each counter electromotive force and the phase of each phase of current, and the steps are as follows:
1) measuring the angle of the motor rotor in real time, and converting the angle into a normalized electrical angle according to the number of pole pairs of the motor rotor;
2) acquiring each phase of current in real time by using a current sensor, and calculating a current zero crossing point in each electrical cycle;
3) based on the principle that the phase difference between the current zero-crossing point and the counter electromotive force zero-crossing point is minimum, and according to the recorded current values and phase values before and after the zero-crossing point, the phase of each phase of current is obtained through an interpolation method;
4) and taking the expected phase as an input quantity, making a difference with the actual phase of each phase of current, inputting the difference to a phase controller, obtaining the control voltage of each phase, then sending the control voltage to a speed controller, obtaining the rotating speed of the motor, and obtaining the expected phase of each phase of current through the motor, thereby realizing the independent closed-loop control of each phase of current.
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Citations (6)
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| CN101154907A (en) * | 2007-08-21 | 2008-04-02 | 南京航空航天大学 | Correction method for position signal phase error of brushless DC motor without position sensor |
| CN101682284A (en) * | 2007-06-27 | 2010-03-24 | 株式会社明电舍 | Pseudo current type 120-degree conduction inverter |
| CN105720876A (en) * | 2015-12-01 | 2016-06-29 | 清华大学 | Inner power factor angle detection method of PMSM |
| CN105827169A (en) * | 2015-12-01 | 2016-08-03 | 清华大学 | Rectangular-axis current detection method for PMSM |
| CN107994818A (en) * | 2017-12-28 | 2018-05-04 | 浙江大学台州研究院 | Control single-phase brushless direct-current motor method is adjusted with internal power factor angle real-time closed-loop |
| CN113014158A (en) * | 2019-12-18 | 2021-06-22 | 珠海格力电器股份有限公司 | Motor control method and device, motor controller, motor and storage medium |
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2022
- 2022-01-21 CN CN202210071866.6A patent/CN114301364A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101682284A (en) * | 2007-06-27 | 2010-03-24 | 株式会社明电舍 | Pseudo current type 120-degree conduction inverter |
| CN101154907A (en) * | 2007-08-21 | 2008-04-02 | 南京航空航天大学 | Correction method for position signal phase error of brushless DC motor without position sensor |
| CN105720876A (en) * | 2015-12-01 | 2016-06-29 | 清华大学 | Inner power factor angle detection method of PMSM |
| CN105827169A (en) * | 2015-12-01 | 2016-08-03 | 清华大学 | Rectangular-axis current detection method for PMSM |
| CN107994818A (en) * | 2017-12-28 | 2018-05-04 | 浙江大学台州研究院 | Control single-phase brushless direct-current motor method is adjusted with internal power factor angle real-time closed-loop |
| CN113014158A (en) * | 2019-12-18 | 2021-06-22 | 珠海格力电器股份有限公司 | Motor control method and device, motor controller, motor and storage medium |
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